Send email on new comment when no admin approval needed?

Hi,

I see that if I turn off “An administrator must always approve the comment” and “Comment author must have a previously approved comment” I get no notifications of new comments on my site.

Can I somehow make it send the notification even though approvals are unchecked in dashboard under “discussion settings”?

And what would be a good way to send this notification to all users registered on this website, and not only to admin? I tried this one:
http://wordpress.org/extend/plugins/wp-comment-notifier-for-all/
but it didn’t work…

thank you